Flex SDK 4.5 doesn’t keep Embed Metadata

If you erally need to access the tEXT meta data inside a PNG and this bug never gets fixed, one workaround is to embed it as a bytearray (mimetype in the ebed tag) and parse it out manually:

http://wonderfl.net/c/oVSK

I’ve not tested this but it looks good:

        public static function getMetaData(png:ByteArray):Object{
            var metaData:Object = {};
            var i:int, j:int, key:String, value:String;
            for(i = 0; i < png.length - 4; i++){
                png.position = i;
                // look for the tEXt chunk type
                if(png.readUnsignedInt() == tEXt_ID){
                    // chunks are broken into length, type, data and CRC
                    // we've stopped at the type, wind back to get the length
                    png.position = i - 4;
                    var totalLength:int = png.readUnsignedInt();
                    // the key/value is broken with a single 0x0 byte
                    var keyLength:int = 0;
                    for(j = 0; j < totalLength; j++){
                        png.position = i + 4 + j;
                        if(png.readByte() == 0x0){
                            keyLength = j;
                            break;
                        }
                    }
                    // capture the key
                    png.position = i + 4;
                    key = png.readMultiByte(keyLength, CHAR_SET);
                    // capture the value
                    png.position = i + 4 + keyLength + 1;
                    value = png.readMultiByte(totalLength - (keyLength + 1), CHAR_SET);
                    metaData[key] = value;
                }
                // quit searching once the IDAT chunk is encountered
                // pngs encoded by this class store the metadata before the IDAT
                if(png.readUnsignedInt() == IDAT_ID){
                    break;
                }
            }
            return metaData;
        }